Knife for nail-cutting machines



(No Model.) 1

W. D. YOUNG.

KNIFE FOR NAIL CUTTING MACHINES. No, 355,113. Patented Dec. 28,1886

' UNITED STATES PATENT OFFICE.

WILLIAM D. YOUNG, OF PITTSBURG, ASSIGNOR TO CHARLES L. FITZHUGH, OF ALLEGHENY CITY, PENNSYLVANIA.

KNlFE FOR NAIL-CUTTING MACHINES.

SPECIFICATION forming part of Letters Patent No. 355,113, dated December 28, 1886.

Application filed November 17, 1886. Serial No. 219,118. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM D. YOUNG,Of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Knives for Nail- Outting Machines, and I do hereby declare the following to be a full, clear, and exact descrip tion thereof.

In the manufacture of cut chisel-pointed nails of steel the ordinary nail-cutting machine has been used with knives which cut a headed and pointed blank.

In Figure 1 of the accompanying drawings the form of the cutting-edges of the knives will be seen, the said view being a plan of the knives when in conjunction. Here a is the moving knife,and b the fixed or bed knife,the

former moving nearly at a right angle to the latter,and sufficiently beyondthe upper edge of the same to completely sever the nail-blank from the plate fromwhich it is cut and to deliver it within range of the gripping-dies which hold it whilebeingheaded. The edges 2, which form the tapered sides of the nails, extend at a proper angle for that purpose, and at the ends they are provided with short bevels 3 and 4, for forming the points and heads of the blanks. The bevels 3 run inwardly and the bevels 4 outwardly, and at each stroke of the knife a one side of the nail-blank is formed, which will be the counterpart in shape of the cutting-edge of the knife b.

In Fig. 2 of the drawings the operation of the knives is clearly illustrated. Here cisthe nail-plate,which is placed between the knives or and b, and the end or scrap 5 is cut off to form the outer edge of the first nail-blank, 6, as shown. Then the plate is reversed in the usual way and inserted between the knives, which at their second cut sever the first nailblank, 6, and form the outer edge of the next nail-blank.

As heretofore made the lower edge of the knife a is straight, and in operating upon steel plate the action of the straight edge upon the stiff hard stock is apt to produce a nail with the point turned slightly to one side, as illustrated in the side view of the nail-blank shown by Fig. 3. This point is always on. the upper side, the effectof the pressure of the knife a .upon the nail-plate,which is partially sepaing knife.

To enable others skilled in the art to make and use my invention, I will now describe it by reference to the accompanying drawings, in which'- Fig. 1 is a plan view'of the cutting-knives of a nail-machine for cutting bevel-pointed nails. Fig. 2 is a plan view of a nail-plate, illustrating the operation of the knives. Fig.3 is aview of the nail-plate,made with astr'aightedged knife of the old form. Fig. 4 is a side view of the old form of moving knife. Fig.5 is a side view of my improved form of mov- Figs. 6 and 7 are side and edge views of the nail made by my improved knives.

Like symbols of reference indicatelike parts in each.

As before stated, the effect of the straightedged knife shown in Fig. 4 is to produce a.

nail like that shown in Fig. 3, in which the point is turned or curved sidewise. I find that by forming aslight projection with abeveled face, which acts upon the upper side of the point of the nail-blank upon the outer edge of the moving knife a, as indicated in Fig. 5 at d, the upper side of the point will be compressed, so as to form a bevel thereon equal to the bevel which is formed on the under side of the blank by the supporting action of the bevel 3 of thebed-die b, so that the defect heretofore existing in steel bevel -pointed nails, produced by the ordinary straight-faced moving knifc,will be completely overcome and cured by the addition of the projection d, and the nail produced will not only be beveled upon the cut sides, but also upon the straight sides of the point, thereby giving a much better driving-nail than is had in the simple bevel-point. I

In the use of my improved moving knife, the point d encounters the nail-plate before any other portion of the knife, and acts with a compressing as well as a shearing eflect upon the sharp point of the blank, so as to compress and bevel it, While the body of the nail is still attached to and supported by the, plate.

Nails produced by my improved moving knife not only drive straight, but much more easily than the ordinary bevel-pointed nail, and are practically perfect.

What I claim as myinvention,and desire to secure by Letters Patent, is-

1. A moving knife for machines for cutting bevel-pointed nails having a beveled projection at the point end, substantially as and for the purposes described.

with a beveled projectiou,substantially as and 20 for the purposes described.

In testimony whereof I have hereunto set my hand this 6th day of Nove1nber,A.D.1886.

' WILLiAM 1). YOUNG.

Witnesses:

W. B. CoRWIN, THOMAS W. BAKEWELL. 

